Luke
Acts 9:21BSB·traditional attribution

All who heard him were astounded and asked, “Isn’t this the man who wreaked havoc in Jerusalem on those who call on this name? And hasn’t he come here to take them as prisoners to the chief priests?”

John Calvin Reformed @genevareformer

21. They were all amazed. This is added, that we may know that the power of God was acknowledged. For seeing that the zeal of Paul against the gospel was openly known, they saw no other cause of such a sudden change but the hand of God.

Matthew Henry Presbyterian @wholebiblehenry

As for God, his work is perfect; if he begin, he will make an end: a good work was begun in Saul, when he was brought to Christ's feet, in that word, Lord, what wilt thou have me to do? And never did Christ leave any that were brought to that. Though Saul was sadly mortified when he lay three days blind, yet he was not abandoned.

Commenting on Acts 9:10-22

John Gill Reformed Baptist @doctorgill

But all that heard him were amazed,.... Not the disciples that believed in Christ, but the unbelievers, as appears from their words: and said, is not this he that destroyed them that called on this name in Jerusalem? they do not express the name of Christ, out of malice and ill will; which shows who they were that said these words, and were astonished to...